Ground-breaking device.



0. ERTER.

GROUND BREAKlNG DEVICE. APPLmATmN ,FILED JUNE 6. 1914.

1,147,492. PdtentdJuly 20, 1915.

2 SHEETS-SHEET 2. I

l/vbtmwom UNITED STATES PATENT oFFioEf.

' DAVID ERTER', OF SPRINGFIELD, OHIO.

GROUND-BREAKING DEVICE.

eration and simple in construction.

- A further 'object of the invention is to provide effective means forapplying pressure to the breaker when in operation and also for raisingand holding the same n inoperative position during transportation.

A further object of the invention 1s to provide a; ground breakingdevice which may be readily attached to a road roller which is inservice so that it will be unneced to.

essary to take the roller out of service for a material length of timeand send 1t to ashop to have the groundbreaking device attached thereto.i v

. A' further object is to provide a ground breaking device, forattachment on a road roller, which shall be so connected to the rollerthatit has a direct dragging act on thereon and is provided with acushioning device whereby any lifting action of the ground on thebreaking device will be taken up by the cushioningdevice, thusrelieving.

the roller of the excessive arring and vibration which the breakingdevice 1s sub ect- A .fu'rther'object is to provide a ground breakingdevice, for attachment on a road roller which shall be so connected tothe roller and with a cushioning device that the latterwill exert asubstantially uniform pressure to force the breaker into the groundregardless of the depth of penetration.

In the accompanying draw1ngs:-F1gure 1 is a side elevation of the rearportion of .a road roller showing my improved devlces applied thereto.Fig. 2 isasection on the line 22 of Fig. 1. Fig. 3 .is a side viewof thepiston guide head. Fig. fl is a section on portation. 1

acters of reference in the several views.

In the said drawings, 1 represents the tank of a road roller and 2 therear wheels. The ground breaking device proper consists of a series ofspikes 13 clamped between two channel bars 4 by/the bolts 5.. There isusu-- Patented July 20, 1915.

Application filed June 6, 1914. Serial No. 843,381.

ally attached to the back of the tank 1, a-

draw bar 26 which has several holes therein for the attachment of chainsor other haul'- ingdevices. In the present case there is secured to thedraft bar 26,'by bolts 26' which engage the holes in the draft bar, apair of brackets 6, having bearings 7 in which bearings is rotatablymounted a transverse shaft 8; the brackets being braced by the bracerods6, secured at their lower-ends to the bearings and at their 'upper endsto the tank! A pair of drag-bars 9, securely bolt- Q ed to the channelbars 4:, are keyed at their forward ends to the transverse shaft 8, as.shown in detail in Fig. 4, the keys being indicated by 10. One of thedrag bars 9 has an upwardly extending crank arm 11, pivotally connectedat its u per end toa link 12' which link 12 has its ,orward endpivotally connected to-the rod 13 of a piston (not shown) located in thecylinder 14, which cylinder is secured to the side of the tank 1.

The end of. the piston rod 13 has firmlyv Sec.

cured thereto a head 15, the upper end of which is provided with anintegrally formed. sleeve 16 arranged to slide on the rigid guide rod 17which is secured firmlyl to-the side of the tank by the brackets 18. Thelower end of I this head 15 has oppositely extending trunnions 19 towhich the link 12 is pivoted; the

link 12 being preferably formed of two members spaced apart by theblocks 12? and rigidly bolted together by. bolts 12 to permit it to bereadily assembled, the crank arm 11 being pivoted between these members,the

rear ends of which are provided with a series of holes 20 to receive thepivot bolt 21 so that theparts may be adjusted to regulate the depth ofdigging and also theheight to which the devices-may be raised-for trans-When it is desired to operate the breaking devices, fluid is admittedinthe" forward end of the cylinder so as to drive the piston to the rearendv thereof and hold the parts in the position shown in full lines inFig. l, thewvalve 23 being allowed to remain in position to maintain thecylinder 14in constant communication with the boiler or tank 25,

as the case may be. To raise the breakers to the position shown indotted lines in Fig. l. fluid is admitted to the rear end of cylin der14.

By this construction effective means are provided for applying pressureto the breakingdeviccs and'for raising them to inoperative position.This fluid operated pressure device also permits the breaking devicesand the machine to which they are attached to rise and fallindependently of each other to compensate for irregularities the groundover which they are traveling; this movement, of course, being againstthe pres.- sure ofthe fluid in the cylinder, which, on account of beingin constant communication with the supply, will be substantially uni:

form.

From the foregoing it will' be apparent that the ground breakingmechanism may be readily attached to the machine, since it is onlynecessary to bolt the brackets 6 to the draw bar 26 and drill holes inthe tank 1 for securing the cylinder 1d and bracket 18. The arrangementof the drag-bar 9 produces a direct drag on the back of the machine andany up and down movements of the channelbars 4 will result inoscillation about the axis of shaft 8, and acushioning movement of thepiston. in cylinder 1%, thereby relieving the machine of much 'joltingand vibration. On accountof the up and down movement of the channel-bars4 being about the 'aXis of the shaft 8 and because of the charactor ofthe connection between the arm 11 and the piston'rod 13, the pressure onthe piston will result in a substantially uniform force being exerted onthe spikes to force them into the ground, irrespective. of the depth atwhich they are working.

Having thus described my invention, ll claim:-- I

1. In combinationwith a self-propelling chine, rearwardly extendingdrag-bars car ried by said shaft, ground breaking spikes carried by saiddrag-bars and downwardly and forwardly inclined relative thereto, anupwardly projecting arm rigid with said drag-bars and having its upperend so arranged as to swing substantially horizontally, and cushioningmeans mounted. on said machine, independently of the means for attaching said shaft to-the machine, and operatively connected with saidarm 2,111 combination with-a self-propelling road machine, a pair ofbearing brackets sccured on the rear thereof, a horizontal shaftrotatably mounted in said brackets, dragbars carried by said shaft,forwardly ainl downwardly inclined ground breaking spikes carried bysaid'drag bars at the rearward ends thereof, an arm rigid with said dragbars and projectingupwardly from said shaft, and combined positioningand bush ioning means mounted on the machine, independently of saidbrackets, and operatively connected with the upper end of said armwhereby said spikes may be forced into the ground by a substantiallyhorizontal force applied to said arm, the bars being so arranged thatthe vertical reaction of the ground on said spikes is opposed by theweight of said machine, exerted through said brackets.

3. In combination with a' self-propelling road machine having front andrear wheels and also having a draw-bar secured to the rear thereof, of aground breaking device pivotally mounted on said drawbar and includingan upwardly projecting arm and forwardly and downwardly inclined spikes,said device being rigid against all movement except rocking on itspivotal mounting, cushioning means mounted on said machine, above andindependently of said draw bar, for the purpose of forcing and holdingsaid spikes'into the ground and also cushioning of upward movements ofsaid spikes, and unyielding connections between said arm and saidcushioning means arranged to transmit forces from one to the other insubstantially uniform ratio, for diilereut operating positions of theparts, said cushioning means and connections permitting said machine tofreely rise and fall relatively to said ground breaking device,

4. In combination. with a self-propelling road machine having front andrear wheels and also having a drawrbar secured on the rear thereof, of aground breaking device pivotally mounted on said draw-bar and rigidagainst all movement except rocking on its pivotai mounting, said groundbreakingdevice including forwardly and downwardly inclined diggingspikes, cushioning means n'iounted on said machine, indcpe ently of saiddi'aw-har, forthe purpose forcing and-holding said spikes into n; 1

ma ma 8 ground and also cushioning all upwarci In testimony whereof, Ihave hereunto set moigment of said spikes, and adjustable unmy hand this2nd day of June 1914.

yie ing connections between said cushioning means and said groundbreaking device DAVID ERTER' 5 adapted to transmit force in asubstantially Witnesses:

uniform ratio for different positions of the CHAS. I. WELQH,

parts. V e -ESTHER E. PFEIFER.

